1) VU440芯片原本不支持LPddR4;
但是可以用“HSUL I/O standard with VCCO set to 1.1V to interface with LPDDR4 at very low data rates (< 300MHz)”,(原来的LPDDR4 IO标准是LVSTL<low voltage="" swing="" terminated="" logic="">)
2)因为LPDDR4的颗粒IO电压是1.1V的; 所以如果客户要验证lpddr4,需要修改VU SODIMM的电压(原来VU SODIMM的电压是ddr4的1.2v电压):
3)根据 Vout=(Rx/1K +1 )*0.5 修改Rx。(我们没有子板,我们客户的经验是在sodimm上做lpddr4的子板,有几个客户是这样做的)
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Asked: 2018-11-15 20:32:25 -0600
Seen: 708 times
Last updated: Jan 13 '20